Wave- Motion in an Elastic Solid. 



229 



For the particular case of the wave-length equal to the radius 

 we have 2 <rru fai . 



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which enables us to write simply 1/27T for ujqo) in equations 

 (59) and (60). For graphic representation of this case we 

 take z=0, which makes all the displacements lie in the 

 plane {xy). 



§ 22. The accompanying drawings help us to understand 



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